The ONE Name.... Rev 19:Rev 19:13 And he was clothed with a vesture dipped in blood: and his name is called: The Word of God.
The ONE NAME is the WORD OF GOD....
So here is the answer to ALL the three commands....
TEACH THEM WHAT? ............THE WORD OF GOD
BAPTIZE THEM IN WHAT? ....THE WORD OF GOD
OBSERVE WHAT?...................THE WORD OF GOD
The Word of God is God... John 1
The word of God was made flesh, Jesus.... John 1
The word of God is the Truth (Spirit of Truth)... John 17 in what we are SANCTIFIED IN!